This has probably been covered but the search button didn't really help me, so thought I would ask.

I have just got some new tyres for my NC35 (second hand but only done 100ks).

The rear is a 160/60 though, will this fit the the standard 525 chain? Some of the threads that I read say they will, some say it wont?

I will be changing the chain and sprockets in the future but just wanted to see if I could put my tyres on first.

When replacing, should I go for the 520 chain? What are the advantages/disadvantages?

Should I change my gearing while I am at it as well? Bike will mainly be used on the street with a few mountain runs here and there.

160's fit no problem if you use a 520 chain, if you still have the 525 chain then Rick oliver sells a spacer kit to space the chain over 5mm so it doesnt hit the tyre.

-1 front on the front sprocket is what most people do although i find it a little peaky for the road, try +2 on the rear instead.

Ahh ok fair enough.

Is there any benefits of going to the 520 chain?

Its lighter, 525 is OTT for a 400

It's definitely over the top for a 400 but i believe Honda had the wet weight of the bikes in mind when deciding on the 525.

Ahh ok great.

Now to find some chains and sprockets!

I've still got the 525 chain which doesn't appear to be in bad condition and a newly modified rear axle to take a 750 wheel, however, what exactly is the chain spacer kit and where/how does it fit?

5mm spacer behind the front sprocket, and the rear is again a 5mm spacer behind the sprocket carrier(i assume, ive never fitted the rear one).